syscall-exec#4

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DeathWish5 wants to merge 15 commits intorcore-os:masterfrom

DeathWish5:syscall-exec

Commits on Feb 10, 2020

finish sys_fork
刘丰源
committed

Commits on Feb 11, 2020

finish sys_exec
deathwish5
committed

Commits on Feb 12, 2020

Commits on Feb 13, 2020

fix bug
刘丰源
committed
fix conflicts(due tofork bug fix)
deathwish5
committed
finish test of sys_exec, simplify some code
deathwish5
committed

Commits on Feb 14, 2020

fix a bug of user_shell
deathwish5
committed
a simpler way to fix the bug
deathwish5
committed